Since I've owned the XR700 not a single Firmware update has fixed the DHCP issues. This mostly happens on the 2.4Ghz channel, leaving half my devices not being able to acquire an IP. I needed a router with SFP+ 10G port and this is the only model that offered at the time, so I was the sucker that didn't return it when I noticed the issue, not to mention the hours of tinkering before realizing it wasn't going to work outside of the original firmware.
XR700-V1.0.1.2 - Works
XR700-V1.0.1.8 - No
XR700-V1.0.1.10 - No
XR700-V1.0.1.18_beta - No
XR700-V1.0.1.20 - No
XR700-V1.0.1.24_beta - No
XR700-V1.0.1.34 - No